Method of preparing yarn packages to facilitate unwinding



Dec. 31, 1935. E g g 2,025,920

METHOD OF PREPARING YARN PACKAGES To FACILITATEUNW'INDING- Filed Aug. 3,1934 ENTOR JAME v B BY HIS ATT N Patented Dec. 31, 1935 METHOD OFPREPARING YARN PACKAGES T FACILITATE UNWINDING James A. Webber, Chester,Pa., assignor to The Viscose Company, Marcus Hook, Pa., a corporationofPennsylvania Application August 3, 1934, Serial No. 738,347

3 Claims.

This invention relates to a method of preparing yarn packages tofacilitate unwinding thereof. The winding machines which are in generaluse for winding yarn packages in the form of cones produce a packagewhich has a fiat top and bottom. This fiat bottom is undesirableinasmuch as the angle which the bottom forms with the side of the yarnpackage is too small to allow any loops which have fallen below thebottom of the yarn wind to deliver freely from the package. Such loopscatching on the bottom of the yarn wind causes the thread to jerkseverely and very often to break.

It has long been felt that, if the bottom of a the yarn packagecouldbeso shaped that it would form a greater angle with the side, then anyloops of thread falling below the yarn wind would not catch but woulddeliver freely. Many attempts have been made to change the shape of theyarn package at the bottom during the winding operation by means ofattachments or changes to the winding machine. Such attempts, however,have not proven successful, particularly in the winding of rayon.

i It is therefore the principal object of the present invention tomodify 'a yarn package which has been wound with a flat base, to roundoff the base or give it a greater angle to the side.

According to the present invention, a new method has been devised forshaping cone yarn packages so that the angle between the bottom and sideis increased to such an extent that any loops of thread falling belowthe bottom of the yarn wind will not catch on the bottom edge of 3 theyarn package as the thread is being delivered. This is done by pressingthe yarn package in a suitable form so that the bottom is cupped or theangle between the bottom and the side of the yarn package is soincreased as to allow a free delivery of the yarn. In forming orpressing the bottom of the cone package to form the cupped bottom, it isoptional whether the yarn package top be cupped or left fiat.

Other objects and features of novelty will become apparent as thefollowing description proceeds, reference being had to the accompanyingdrawing, in which Figure 1 is a vertical section through the jaws of apress, showing the flat based yarn cone therein in elevation, beforepressing;

Figure 2 is a similar view, showing the jaws pressing the cone, the conebeing in vertical section to show the pressed contour of the base;

The yarn package 6 is inserted between the jawsof a press or mold, thejaw or matrix I0 adjacent the flat base or larger end 5 of the conebeing concave. Preferably'the upper jaw 12 is convex and of reversecontour to the jaw H1.

The lower jaw I as shown has a recess l3 to receive the adjacent end ofthe cone 8 and avoid crushing the same. A similar recess I4 is providedin the upper jaw i2, to receive the upper end of the cone 8, for thesame purpose.

The jaws l0 and H are urged toward each other in any desired manner, tocompress the yarn package 4 therebetween. As shown in Fig-' that theconvolutions of the yarn in the package slide upon each other axially,to permit this shaping of the package, without damage to the fibers.

The finished shaped cone is shown in Figure 3, in which the lower orlarger base 5 of the yarn' package has the desired rounded contour, orshape giving the base a greater angle to the side 1 than that shown inFigure 1.

What I claim is: r

1. Method of reforming a yarn package to convex the flat base thereofand avoid loops catching thereon during unwinding, which comprisesmoving all portions of the periphery and each annular layer of yarn insaid package, relative to the adjacent annular layer of yarntherewithin, and toward the top thereof, while decreasing such movementsprogressively toward the center, by

, continuously applying pressure in the direction of the top to theouter margin of said base while leaving the center thereof free andcontinuously applying equal pressureintheoppositedirection to the centerof the top while leaving the circumference thereof free the pressurebeing applied by contacting the outer layers and after movement thereofthe next adjacent layers toward the center. and the opposite pressurebeing applied to next adjacent layers toward the edge, after movement orthe center layer.

2. Method of reforming a yarn package to convex the flat base thereofand avoid loops catching thereon during unwinding, which comprisesapplying upward pressure to said base by contacting the annular layersthereof cumulatively toward the center, and resisting said pressure bycontacting the layers of the top of the yarn package cumulatively towardthe circumference. whereby each contacted layer is displaced upwardlyrela-' tive to the adjacent layer therewithin.

3. Method of reforming a y packageto convex the flat base thereof and aold loops catching thereon during unwinding, which comprises applyingupward pressure to said base by contacting the periphery thereof and theannular layers therewithin cumulatively toward the center, resistingsaid pressure by contacting the layers of the top in the oppositedirection, and preventing it said resistance contact with the outerlayers'ot the top in advance of contact with the center thereof, wherebymovement toward the top is imparted to the periphery of said yarnpackage and the annular layers of'yarn therewithin but de- 1t creasingtoward the center, said movement displacing upwardly portions of saidperiphery and layers near the top as well as near the base.

JAMES A. WEBBER.

